logilab-common #20403 reorganize (or maybe even split out) lgc.db and lgc.adbh [resolved]

These two modules are growing, and they are starting to beg for a refactoring. I'd like to, when I get some time for this, turn them into a dbapi package (either a subpackage of lgc or a separate project), with separate modules for the different backends we support, so that navigation in the code becomes manageable.

done in0.49.0
load left0.000
closed by<not specified>
see also
logilab-database utilities for database manipulation